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+/* conditional.h
+
+ Copyright 2009 Taco Hoekwater <taco@luatex.org>
+
+ This file is part of LuaTeX.
+
+ LuaTeX is free software; you can redistribute it and/or modify it under
+ the terms of the GNU General Public License as published by the Free
+ Software Foundation; either version 2 of the License, or (at your
+ option) any later version.
+
+ LuaTeX is distributed in the hope that it will be useful, but WITHOUT
+ ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
+ License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with LuaTeX; if not, see <http://www.gnu.org/licenses/>. */
+
+/* $Id: conditional.h 3261 2009-12-18 11:38:21Z taco $ */
+
+#ifndef CONDITIONAL_H
+# define CONDITIONAL_H
+
+
+# define unless_code 32 /* amount added for `\.{\\unless}' prefix */
+
+typedef enum {
+ if_char_code = 0, /* `\.{\\if}' */
+ if_cat_code = 1, /* `\.{\\ifcat}' */
+ if_int_code = 2, /* `\.{\\ifnum}' */
+ if_dim_code = 3, /* `\.{\\ifdim}' */
+ if_odd_code = 4, /* `\.{\\ifodd}' */
+ if_vmode_code = 5, /* `\.{\\ifvmode}' */
+ if_hmode_code = 6, /* `\.{\\ifhmode}' */
+ if_mmode_code = 7, /* `\.{\\ifmmode}' */
+ if_inner_code = 8, /* `\.{\\ifinner}' */
+ if_void_code = 9, /* `\.{\\ifvoid}' */
+ if_hbox_code = 10, /* `\.{\\ifhbox}' */
+ if_vbox_code = 11, /* `\.{\\ifvbox}' */
+ ifx_code = 12, /* `\.{\\ifx}' */
+ if_eof_code = 13, /* `\.{\\ifeof}' */
+ if_true_code = 14, /* `\.{\\iftrue}' */
+ if_false_code = 15, /* `\.{\\iffalse}' */
+ if_case_code = 16, /* `\.{\\ifcase}' */
+ if_def_code = 17, /* `\.{\\ifdefined}' */
+ if_cs_code = 18, /* `\.{\\ifcsname}' */
+ if_font_char_code = 19, /* `\.{\\iffontchar}' */
+ if_in_csname_code = 20, /* `\.{\\ifincsname}' */
+ if_primitive_code = 21, /* `\.{\\ifprimitive}' */
+ if_abs_num_code = 22, /* `\.{\\ifabsnum}' */
+ if_abs_dim_code = 23, /* `\.{\\ifabsdim}' */
+} if_type_codes;
+
+
+
+
+# define if_limit_subtype(A) subtype((A)+1)
+# define if_limit_type(A) type((A)+1)
+# define if_line_field(A) vlink((A)+1)
+
+typedef enum {
+ if_code = 1, /* code for \.{\\if...} being evaluated */
+ fi_code = 2, /* code for \.{\\fi} */
+ else_code = 3, /* code for \.{\\else} */
+ or_code = 4, /* code for \.{\\or} */
+} else_type_codes;
+
+extern halfword cond_ptr; /* top of the condition stack */
+extern int if_limit; /* upper bound on |fi_or_else| codes */
+extern int cur_if; /* type of conditional being worked on */
+extern int if_line; /* line where that conditional began */
+extern int skip_line; /* skipping began here */
+
+extern void pass_text(void);
+extern void push_condition_stack(void);
+extern void pop_condition_stack(void);
+extern void change_if_limit(int l, halfword p);
+
+extern void conditional(void);
+
+#endif